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This DCHECK was added to validate the hypothesized cause of a bug. The
change is no longer necessary and shouldn't be included in the release.

Bug: 959194
Bug: 1004429
Change-Id: I48ddf24dfef0372f57d3705600918fe43e6744df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803670Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697208}